Background: School bullying occurs throughout the world and affects a significant proportion of children and adolescents. It is estimated that 246 million of them experience school violence and bullying every year. Psychiatric nurses plays a prominent role in clarificarion of the seriousness of bullying behaviors and its effect on students self-esteem.

Aim: This study aimed to assess the effect of bullying behavior on self-esteem among preparatory school students.

Design: A correlational research design study was carried out on a stratified sample of 250 student from Huda Al-shaarawy Formal Language School and Ahmed Hamdy School.

Tools: 1) Socio-demographic characteristics questionnaire, 2) Bullying scale, and 3) Self-esteem scale.

Results: This study represented that 56% of the studied students had poor knowledge about bullying with 67.2% of all the studied students were exposed to bullying, out of this percentage 97.1%, 91.7%, and 72.1% were exposed to bulling by hitting, calling bad names, and threatening, respectively. As well, the majority of studied groups suffered from effect of bullying; (64.8%, 63.2%, 54.8% and 54%) of them suffered of sleep disturbances, abdominal pain, low self-confidence and aggression, respectively. there was a highly statistical significant relation between prevalence of bullying among the studied group and total level of students’ attitude, along with the total level of their self-esteem. There was a highly statistical significant relation between the students’ socio-demographic characteristics and total level of their self-esteem.

Conclusion: Current study concluded that, majority of studied students were exposing to and participating in different types of bulling. The majority of the studied group suffered from low self-confidence and aggression with physical and psychological consequences of bullying.

Recommendation: Designate instructional module in Arabic booklet to be readily accessible for nurses, school staff and student with the strongest knowledge base about bullying and the process of dealing with or controlling them.